The entire group of interest to researchers and the group to which they want to generalize their findings is called the _____. The group that actually participates in a researcher's study is called the ___

The same gene produces legs in butterflies, cats, centipedes, and humans

Indicate whether this statement is true or false.

Why has birth for humans become increasingly difficult?

a. Because humans have such extraordinarily large brains. b. Because humans are more likely to have genetic difficulties. c. Because humans are the only species to have single births. d. Because humans are so immature at the time of birth.